The photo has divided people with all kinds of answers on the Reddit thread, ranging from the woman in the middle having her legs broken, to someone even suggesting that she is some kind of couch-centaur monster.

When you trace the two women in the middle the answer becomes apparent. The third woman with the wine glass has her body tilted toward the camera, which make it seem as if her legs belong to the woman to the left of her. The first two women also are wearing black jeans, which makes it seem like the second woman is wearing light blue jeans.

So to reiterate, the first two women are wearing black jeans and have their legs close together, which makes it look like one pair of legs and creates the illusion that the woman in the middle doesn’t have any legs at all.